Node Cookbook - Third Edition

Manipulating metadata

By now we have learned how to fetch information about a file or directory, but how do we alter specific qualities?

Let's create a small program that creates a file, sets the UID and GID to nobody, and sets access permissions to 000 (not readable, writeable, or executable):

const fs = require('fs') const { execSync } = require('child_process')  const file = process.argv[2] if (!file) {    console.error('specify a file')   process.exit(1) } try {   fs.accessSync(file)   console.error('file already exists')   process.exit(1) } catch (e) {   makeIt() }  function makeIt() {   const nobody = Number(execSync('id -u nobody').toString().trim())   fs.writeFileSync(file, '')   fs.chownSync(file, nobody, nobody)   fs.chmodSync(file, 0)  console.log(file ...